Chen Gangshu, Li Pengwei, Xue Tangyue, Su Meng, Ma Junjie, Zhang Yiqiang, Wu Tianhao, Han Liyuan, Aldamasy Mahmoud, Li Meng, Li Zehua, Ma Jiale, Chen Shuyao, Zhao Yao, Wang Fuyi, Song Yanlin
State Centre for International Cooperation on Designer Low-Carbon and Environmental Material (SCICDLCEM), School of Materials Science and Engineering, Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450001, P. R. China.
Key Laboratory of Green Printing, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing Engineering Research Center of Nanomaterials for Green Printing Technology, National Laboratory for Molecular Sciences (BNLMS), Beijing, 100190, P. R. China.
Small. 2021 Jul;17(30):e2101380. doi: 10.1002/smll.202101380. Epub 2021 Jun 23.
Novel all-inorganic Sn-Pb alloyed perovskites are developed aiming for low toxicity, low bandgap, and long-term stability. Among them, CsPb Sn I Br is predicted as an ideal perovskite with favorable band gap, but previously is demonstrated unable to convert to perovskite phase by thermal annealing. In this report, a series of CsPb Sn I Br perovskites with tunable bandgaps from 1.92 to 1.38 eV are successfully prepared for the first time via low annealing temperature (60 °C). Compared to the pure CsPbI Br, these Sn-Pb alloyed perovskites show superior stability. Furthermore, a novel α-phase-stabilization mechanism of the inorganic Sn-Pb alloyed perovskite by reconfiguring the perovskite crystallization process with chloride doping is provided. Simultaneously, a dense protection layer is formed by the coordination reaction between the surface lead dangling bonds and sulfate ion to retard the permeation of external oxygen and moisture, leading to less oxidation of Sn in perovskite film. As a result, the fabricated all-inorganic Sn-Pb perovskite solar cells (PSCs) show a champion power conversion efficiency of 10.39% with improved phase stability and long-term ambient stability against light, heat, and humidity. This work provides a viable strategy in fabricating high-performance narrow-bandgap all-inorganic PSCs.
开发新型全无机Sn-Pb合金钙钛矿是为了实现低毒性、低带隙和长期稳定性。其中，CsPbSnIBr被预测为具有良好带隙的理想钙钛矿，但此前已证明其无法通过热退火转化为钙钛矿相。在本报告中，首次通过低退火温度（60°C）成功制备了一系列带隙可调范围为1.92至1.38 eV的CsPbSnIBr钙钛矿。与纯CsPbIBr相比，这些Sn-Pb合金钙钛矿表现出优异的稳定性。此外，还提供了一种通过氯化物掺杂重新配置钙钛矿结晶过程来实现无机Sn-Pb合金钙钛矿α相稳定的新机制。同时，表面铅悬键与硫酸根离子之间的配位反应形成了致密的保护层，以阻止外部氧气和水分的渗透，从而减少钙钛矿薄膜中Sn的氧化。结果，所制备的全无机Sn-Pb钙钛矿太阳能电池（PSC）的最佳功率转换效率为10.39%，具有改善的相稳定性以及在光、热和湿度环境下的长期稳定性。这项工作为制造高性能窄带隙全无机PSC提供了一种可行的策略。
